Specifies a callback to call whenever an entry needs to be closed (See "BINDINGS" below).
This method is called with one argument,
the pathname of the entry.
This method should perform appropriate actions to close the specified entry.
If the -closecmd option is not specified,
the default closing action is to hide all child entries of the specified entry.

A Boolean value that specifies when a branch should be opened or closed.
A branch will always be opened or closed when the user presses the (+) and (-) indicators.
However,
when the user invokes a branch (by doublc-clicking or pressing <Return>),
the branch will be opened or closed only if -ignoreinvoke is set to false (the default setting).

Specifies a callback to call whenever an entry needs to be opened (See "BINDINGS" below).
This method is called with one argument,
the pathname of the entry.
This method should perform appropriate actions to open the specified entry.
If the -opencmd option is not specified,
the default opening action is to show all the child entries of the specified entry.

The Tree method creates a new window and makes it into a Tree widget and return a reference to it.
Additional options,
described above,
may be specified on the command line or in the option database to configure aspects of the Tree widget such as its cursor and relief.

The Tree widget can be used to display hierarchical data in a tree form.
The user can adjust the view of the tree by opening or closing parts of the tree.

To display a static tree structure,
you can add the entries into the Tree widget and hide any entries as desired.
Then you can call the autosetmode method.
This will set up the Tree widget so that it handles all the open and close events automatically.
the demonstration program Tixish/examples/perl-tix-tree).

The above method is not applicable if you want to maintain a dynamic tree structure,
i.e,
you do not know all the entries in the tree and you need to add or delete entries subsequently.
To do this,
you should first create the entries in the Tree widget.
Then,
use the setmode method to indicate the entries that can be opened or closed,
and use the -opencmd and -closecmd options to handle the opening and closing events.
(Please see the demonstration program Tixish/examples/perl-tix-dyntree).

The Tree method creates a widget object.
This object supports the configure and cget methods described in Tk::options which can be used to enquire and modify the options described above.
The widget also inherits all the methods provided by the generic Tk::Widget class.

This method calls the setmode method for all the entries in this Tree widget: if an entry has no child entries, its mode is set to none. Otherwise, if the entry has any hidden child entries, its mode is set to open; otherwise its mode is set to close.

This method is used to indicate whether the entry given by entryPath has children entries and whether the children are visible. mode must be one of open, close or none. If mode is set to open, a (+) indicator is drawn next to the entry. If mode is set to close, a (-) indicator is drawn next to the entry. If mode is set to none, no indicators will be drawn for this entry. The default mode is none. The open mode indicates the entry has hidden children and this entry can be opened by the user. The close mode indicates that all the children of the entry are now visible and the entry can be closed by the user.